5-Substituted indan-2-carboxylic acid and functional derivatives

ABSTRACT

5-Substituted indan-2-carboxylic acids and functional derivatives thereof having inflammation-reducing properties have the general formula ##STR1## in which R is a phenyl, phenyl-lower alkenyl, phenyl-lower alkyl, phenyl substituted by at least one of the halogens, lower alkyl, lower alkoxy, acetamido, amino, lower dialkylamino, nitro, phenyl, lower alkylsulfonyl, lower dialkylaminosulfonyl and sulfamido, cyclohexyl, furyl, lower alkylfuryl, thienyl, halothienyl, lower alkylthienyl, or pyridyl group and R&#39; is a hydroxyl, lower alkoxy, lower dialkylaminoalkoxy, cinnamoylamido lower alkoxy, 2-hydroxyethylamino, amino or lower dialkylaminoalkyl amino group. Besides the esters and amides, the functional derivatives of the acids include the pharmacologically acceptable salts of the above compounds. The compounds are also of low toxicity, have analgesic activity and exert an antipyretic effect.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a Divisional, as well as a Continuation-In-Part, of U.S. Application Ser. No. 756,862, now abandoned, filed Jan. 4, 1977, the entire contents of which are hereby incorporated by reference.

FIELD OF THE INVENTION

This invention relates to new derivatives of indan, to methods of preparing the same, and to their use as medicaments.

DESCRIPTION OF THE PRIOR ART

The inflammation-reducing properties of certain 5-cycloalkyl-indan-1-carboxylic acids are known, as also are the inflammation-reducing and analgesic properties of alkyl or acyl-indan-1-carboxylic acids. Finally, it is also known that certain 6-acyl-indan-2-carboxylic acids have lipidemia-reducing properties.

SUMMARY OF THE INVENTION

In accordance with the invention, new 5-cycloalkyl, 5-aroyl and 5-heteroaroyl indan-2-carboxylic acids have been prepared and their remarkable inflammation reducing, analgesic and antipyretic properties have been discovered.

GENERAL DESCRIPTION OF THE INVENTION

The acids of the present invention are represented by the general formula ##STR2## in which R is an aryl, a heteroaryl or a cycloalkyl group.

R may be a phenyl, a phenyl-lower alkyl or a phenyl-lower alkenyl group, a substituted phenyl group, a furyl group, a thienyl group (which may be substituted, preferably monohalothienyl), a pyridyl group or a cyclohexyl group.

When R is a phenyl group, it may be substituted by one or more halogen atoms, lower alkyl, lower alkoxy, acetamido, amino, dialkylamino, nitro, phenyl, alkylsulfonyl, dialkylaminosulfonyl or sulfamido groups.

When R is a substituted thienyl group, there is at least one substituent chosen from the halogen atoms and lower alkyl groups.

Preferably, when R is a phenyl radical, it is substituted by at least one substituent chosen from chlorine and the acetamido, dimethylamino, methylsulfonyl, dimethylsulfonyl and sulfamido radicals, and when R is a substituted thienyl radical, it is substituted by at least one substituent chosen from chlorine and the methyl radical. When R is a furyl radical, it is substituted by a methyl radical.

Specific and non-limiting preferred examples of the acids in accordance with the present invention include 5-(p-dimethylaminobenzoyl)-indan-2-carboxylic acid, 5-(p-methylsulfonylbenzoyl)-indan-2-carboxylic acid, 5-(p-sulfamidobenzoyl)-indan-2-carboxylic acid, 5-(p-dimethylaminosulfonylbenzoyl)-indan-2-carboxylic acid, 5-(4'-acetamido-3'-chlorobenzoyl)-2-carboxylic acid, 5-(3'-methyl-2'-thenoyl)-indan-2-carboxylic acid, 5-(4',5'-dichloro-2'-thenoyl)-indan-2-carboxylic acid, and 5-(5'-methyl-2'-furoyl)-indan-2-carboxylic acid.

Derivatives of these acids in the form of therapeutically acceptable salts or the esters such as the lower aliphatic esters, the amino-esters such as the lower dialkylamino-lower-alkyl esters and the cinnamic esters, and in the form of amides such as the carboxamides, which may be substituted on the nitrogen atom, are therapeutically useful and constitute a part of the invention.

Preferred esters are the lower aliphatic esters, and, particularly when R is thienyl or furyl, the lower dialkylaminoalkyl esters, for example, 2'-(N,N-diethylaminoethyl)5-(2'-thenoyl)-indan-2-carboxylate and 2'-(N,N-diethylaminoethyl)5-(2'-furoyl)-indan-2-carboxylate.

Preferred amides include the lower alkylamino-lower-alkyl amides derived from carboxylic acids represented by general formula I in which R is a phenyl radical which can be substituted by up to two halogen atoms, or a thienyl radical. Specific and non-limiting preferred examples of such carboxamides are the diethylaminocarboxamides such as N-[2'-(N',N'-diethylaminoethyl)]5-benzoyl-indan-2-carboxamide, N-[2'-(N',N'-diethylaminoethyl)]5-(2'-thenoyl)-indan-2-carboxamide and N-[2'-(N',N'-diethylaminoethyl)]5-(2',5'-dichlorobenzoyl)-indan-2-carboxamide.

Throughout the present specification and claims the term lower alkyl, as well as the term alkyl, unless otherwise specified, refers to C₁ -C₅ alkyl.

The compounds of the present invention may be obtained by a variety of synthetic procedures.

METHOD A

The compounds can be obtained by alkaline hydrolysis of an ester having the general formula IV. The starting material is an ester having the general formula II in which R' is preferably a lower alkyl group ##STR3##

(a) An aroyl halide having the general formula III

    R--COX                                                     (III)

in which R is as defined above and X is a halogen, is reacted with the ester of general formula II under Friedel-Crafts conditions.

The reaction may be performed with or without a solvent, but preferably using a suitable solvent such as methylene chloride or carbon disulphide, etc., at a temperature between 0° C. and the boiling point of the solvent and preferably at the reflux temperature of the solvent. Among the Lewis acids which may be used under Friedel-Crafts conditions, anhydrous aluminum chloride is preferred. The reactants employed may be present in stoichiometric quantities or in excess, but preferably there is an excess of the aroyl halide and of aluminum chloride, which excess may be as much as 400%.

(b) An excess of ester II is reacted with an aroyl halide having the general formula III in the presence of a catalytic quantity of zinc oxide. An excess of ester II as great as 100% may be present and the reaction preferably takes place in the absence of a solvent at the reflux temperature of the reaction mixture.

In this way there are obtained the compounds having the general formula IV ##STR4## in which R and R' are as above defined.

To obtain the acids of general formula I it is merely necessary to subject the compounds of general formula IV to hydrolysis under alkaline conditions. The bases which may be used include soda and potash and they are used in an aqueous alcoholic medium, for example, at temperatures between ambient temperature and the reflux temperature of the reaction mixture. The bases are used in stoichiometric proportion or in excess, preferably in excess, and the proportion of alkanol may be up to 100%. The hydrolysis product is then acidified to liberate the acid.

For the compounds wherein R is a phenyl group substituted by a sulfamido or dimethylsulfamido radical, an ester of formula (IV) is the starting point in which R' is a lower alkyl group and R is a phenyl group substituted by an amino radical. This ester is subjected to diazotization by techniques known of themselves, after which the aryldiazonium salt obtained is treated with a solution of sulfur dioxide in acetic acid in the presence of a copper salt, preferably cupric chloride, in order to obtain a compound of formula (IV) in which R' has the same meaning as above and R is a phenyl radical appropriately substituted by a chlorosulfonyl radical.

When the latter is treated with gaseous ammonia or ammonia in a water or lower alkanol solution, the compound of formula (IV) is obtained wherein R is a phenyl radical substituted by a sulfamido radical. If the ammonia is replaced by dimethylamine, a compound with formula (IV) is obtained wherein R is a phenyl radical substituted by a dimethylsulfamido radical.

For the compounds wherein R is a phenyl radical substituted by a dimethylamino radical, a compound of formula (IV) in which R' is a lower alkyl group and R is a phenyl radical substituted by an amino radical is treated with formaldehyde in its monomeric form, either pure or in a water solution, in the presence of hydrogen and of a hydrogenation catalyst, preferably palladium on carbon at an appropriate temperature.

In this way compounds with formula (IV) are obtained for which R is a phenyl group substituted by a dimethylamino radical, R' having the same meaning as before.

Finally, when R is a radical substituted by at least one halogen, these compounds are obtained by treating a compound of formula (IV) in which R is a phenyl, thienyl, or monosubstituted furyl radical and R' has the same meaning as before, with a halogen solution in acetic acid, this solution being either saturated or unsaturated and the reaction taking place at temperatures between ambient temperature and the reflux temperature.

METHOD B

In the first step an appropriately substituted orthoxylene having the general formula V ##STR5## is prepared by either of the procedures (a) or (b) described under Method A.

Using as starting materials compounds having the general formula V there are first obtained compounds having the general formula VI: ##STR6## in which R is as above defined and X is a halogen atom, preferably bromine, either by the direct action of a halogen on a compound of general formula V whilst irradiating with ultra-violet light and preferably at the reflux temperature of the mixture, or, in the case of bromine, by the action of N-bromosuccinimide on a compound of the general formula V in solution in a suitable solvent such as carbon tetrachloride, and in the presence of a catalyst such as an organic peroxide, preferably benzoyl peroxide, or of α,α'-azobisisobutyronitrile whilst irradiating with ultra-violet light. The reaction is generally carried out at temperatures between ambient temperature and the boiling point of the solvent and preferably under reflux.

Compounds having the general formula VII ##STR7## in which R is as above defined and R' is a lower alkyl group, are obtained from compounds having the general formula VI by the reaction therewith of a malonic ester having the general formula ##STR8## in which R' is as defined above, in the presence of an alkali metal alkanolate dissolved in a lower alkanol or in ethyl carbonate, preferably in ethyl carbonate, and at temperatures between ambient temperature and the reflux temperature of the solvent and preferably under reflux.

The acids having the general formula VIII, in which R is as above defined ##STR9## are obtained from the esters having the general formula VII by alkaline hydrolysis in an aqueous alcoholic medium at temperatures between ambient temperature and the reflux temperature, and preferably at the latter. The bases which may be used for this hydrolysis are preferably potash or soda, and they are used in proportions which may be between the stoichiometric proportion and a 100% excess and are preferably used in a 100% excess. The proportion of lower alkanol in the aqueous alcohol mixture may be up to 100%.

The compounds having the general formula I are obtained from acids having general formula VIII by subjecting the latter to decarboxylation by a known method, for example, by heating the diacid to its melting point or by heating the diacid to reflux in a hydracid such as concentrated hydrochloric acid.

As an alternative, the esters having general formula VII may be directly decarboxylated to compounds of general formula IV by heating the esters in dimethyl sulphoxide in the presence of water and of sodium chloride at temperatures between 120° C. and the reflux temperature of the solvent.

METHOD C

In this method, a solution of a Grignard reagent is prepared in known manner in a suitable solvent such as diethyl ether or tetrahydrofuran, for example, by reacting a metal such as magnesium or lithium, and preferably magnesium, with an appropriately substituted halo-orthoxylene having the general formula: ##STR10## in which X is a halogen atom.

The solution of Grignard reagent is then reacted with an aroyl halide having the general formula III dissolved in a solvent such as diethyl ether or tetrahydrofuran at a temperature between 0° C. and the reflux temperature of the solvent used, preferably at the reflux temperature of the solvent.

After acid hydrolysis and the appropriate processing, there is thus obtained a compound having the general formula V which is then submitted to the same series of reactions as described for method B.

The pharmacological inflammation reducing, analgesic and antipyretic activities of the compounds according to the present invention have been demonstrated in animal experimentation. The examples are not limiting.

A--The substances are of low toxicity. For example, the LD 50 value (oral route), determined in mice, of various compounds in accordance with the present invention are shown in column A of Table I.

B--Analgesic activity in the mouse was determined by the method of Koster et al. (Fed. Proc. 1959, Vol. 18, page 412). The active dose 50 (AD₅₀) value for various compounds in accordance with the present invention was determined, namely, that dose which, when administered orally, reduces by 50% the spasms of pain caused by the intraperitoneal injection of a solution of acetic acid. Results are shown in column B of Table I.

C--The anti-inflammatory activity was demonstrated by the carrageenin-induced edema test of Winter et al. (Proc. Exp. Biol. Med., Volume 111, pages 544-47). The protection afforded, by oral administration of the compound to a rat against edema induced by injecting a suspension of carrageenin under the arch of the foot of the animal was investigated. The AD₃₀ dose is that which inhibits the edema by 30%. Results are shown in column C of Table I.

D--The protective effect against inflammation resulting from exposure to radiation was determined in albino guinea pigs using the method of Winder et al (Arch. Inv. Pharmacodyn. 1958, Vol. 116, page 261). The AD₅₀ value was determined for the test substance, namely the amount which, when administered to the animal orally, reduced by 50% the erythema produced by exposing the shaved dorsal skin of the guinea pig to ultra violet radiation. Results are shown in column D of Table I.

E--The anti-inflammatory activity was also determined by the aggregation-inhibiting effect of the compounds in accordance with the present invention, in vitro, on platelets the aggregation of which was induced by collagen, in accordance with the method of Born (Journal of Physiology, 1962, Vol. 162, page 67). It is known that compounds which inhibit the activity or quantity of prostaglandin synthetase will inhibit the formation of prostaglandin PGE₂ and the inflammatory and pyretic effect thereof. Since prostaglandin PGE₂ also causes an increase in platelet aggregation, this test is an effective indication of anti-inflammatory and anti-pyretic activity due to inhibition of prostaglandin synthetase. Column E of Table I shows the minimal active concentration in γ/ml of various compounds in accordance with the present invention.

                                      TABLE I                                      __________________________________________________________________________                                               E                                                                              Platelet                                                    B      C      D    Aggregation                                            A    Acetic Acid                                                                           Carrageenin                                                                           U.V. Induced By                                             LD.sub.50                                                                           AD.sub.50                                                                             AD.sub.30                                                                             AD.sub.50                                                                           Collagen                                               mg/kg                                                                               mg/kg  mg/kg  mg/kg                                                                               γ/ml                           __________________________________________________________________________     5-benzoyl-indan-2-carboxylic acid                                                                2,100                                                                               40     18     40   2.5                                  5-(4'-methoxybenzoyl)-indan-2-                                                 carboxylic acid     650                                                                               6      13     34   2.5                                  methyl 5-(4'-dimethylaminobenzoyl)-                                            indan-2-carboxylate                                                                              1,450                                                                               2.5    12     24   0.25                                 methyl 5-(2'-furoyl)-indan-2-                                                  carboxylate       3,200                                                                               9      13     19   1                                    5-(2'-furoyl)-indan-2-carboxylic                                               acid              1,000                                                                               11     23     14   1                                    5-(2'-thenoyl)-indan-2-carboxylic                                              acid              1,200                                                                               6.5    10     21   2.5                                  5-(3'-furoyl)-indan-2-carboxylic                                               acid              2,400                                                                               16     20     18   5                                    5-(5'-methyl-2'-thenoyl)-indan-                                                2-carboxylic acid 3,000                                                                               12     7.5    14   1                                    5-(3'-methyl-2'-thenoyl)-indan-                                                2-carboxylic acid 1,200                                                                               37     26     25   10                                   5-(5'-methyl-2'-furoyl)-indan-                                                 2-carboxylic acid 2,400                                                                               8      10     16   1                                    5-(p-dimethylaminobenzoyl)-indan-                                              2-carboxylic acid   960                                                                               3      14     20   0.5                                  5-(p-methylsulfonylbenzoyl)-                                                   indan-2-carboxylic acid                                                                          2,800                                                                               35     40     10   1                                    5-(p-sulfamidobenzoyl)-indan-2-                                                carboxylic acid   >3,200                                                                              25     43     90   5                                    5-(p-dimethylaminosulfonylbenzoyl)-                                            indan-2-carboxylic acid                                                                          2,600                                                                               80     160    >300 10                                   ethyl 5-(4'-acetamido-3'-                                                      chlorobenzoyl)-indan-2-                                                        carboxylate       3,200                                                                               35     60     80   5                                    5-(4',5'-dichloro-2'-thenoyl)-                                                 indan-2-carboxylic acid                                                                            180                                                                               30     42     90   7.5                                  2'-(N,N-diethylaminoethyl) 5-(2'-                                              thenoyl)-indan-2-carboxylate,                                                  hydrochloride     2,160                                                                               4      8      10   0.25                                 2'-(N,N-diethylaminoethyl) 5-(2'-                                              furoyl)-indan-2-carboxylate,                                                   hydrochloride     1,200                                                                               8      18     20   1                                    N-[2'-(N',N'-diethylaminoethyl)]                                               5-benzoyl-indan-2-carboxamide,                                                 oxalate           1,100                                                                               30     9      25   2.5                                  N-[2'-(N',N'-diethylaminoethyl)]                                               5-(2'-thenoyl)-indan-2-                                                        carboxamide, oxalate                                                                               660                                                                               2.5    8      10   0.25                                 N-[2'-(N',N'-diethylaminoethyl)]                                               5-(2',5'-dichlorobenzoyl)-                                                     indan-2-carboxamide, oxalate                                                                       720                                                                               15     25     50   2.5                                  __________________________________________________________________________

Therapeutic compositions consisting of at least one compound according to the present invention as an active ingredient, together with a solid or liquid pharmaceutical excipient or diluent, may be in the form of tablets, injectable solutions, suppositories or the like.

    ______________________________________                                         Example of formulation                                                         ______________________________________                                         5-Benzoyl-indan-2-carboxylic acid                                                                       200      mg                                           Excipients:                                                                    Lactose                  30       mg                                           Wheat starch             29       mg                                           Talc                     10       mg                                           Gelatin                  5        mg                                           Alginic acid             20       mg                                           Fecula                   5        mg                                           Magnesium stearate       1        mg                                           For a tablet weighing    300      mg                                           ______________________________________                                    

Therapeutic compositions containing an indan derivative according to the invention as their active ingredient are effective for reducing inflammation, as analgesics and antipyretics in unit doses of from 50 to 500 mg. The dosage may be adjusted to obtain the optimum therapeutic effect.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The following non-limitative examples illustrate the preparation of the compounds of the present invention.

EXAMPLE NO. 1 Methyl 5-benzoyl-indan-2-carboxylate ##STR11##

In a 250 cm³ reaction vessel fitted with a stirrer, a cooler, a dropping funnel and a thermometer, is placed 23.2 g (0.173 mole) of anhydrous aluminum chloride in suspension in 40 ml of methylene chloride. 35.3 g (0.252 mole) of benzoyl chloride dissolved in 40 cm³ of methylene chloride is then slowly added at ambient temperature. The aluminum chloride tends to pass into solution while the temperature gradually rises several degrees. The mixture is cooled to hold the temperature close to 20° C. and a solution of 11.1 g (0.063 mole) of methyl indane-2-carboxylate dissolved in 50 cm³ of methylene chloride is added. The temperature gradually rises during the course of the addition and the mixture turns a light brown color. The mixture is stirred for one hour at ambient temperature and is then heated to reflux for 3 hours. After cooling, the mixture is poured into acidified iced water and the resulting mixture is extracted with chloroform. The chloroform extract is then washed with water containing caustic soda, then with slightly acidified water and finally with water. It is dried over anhydrous sodium sulphate. The product is then filtered and the filtrate concentrated to an oily residue which is distilled and a fraction is collected boiling at 178°-184° C. at 0.6 to 0.8 torr.

EXAMPLE NO. 2 5-benzoyl-indan-2-carboxylic acid ##STR12##

To a 100 cm³ reaction vessel equipped with a stirrer and a cooler are successively added: 2.2 g (0.026 mole+50%) of potash dissolved in 40 cm³ of water and 7.3 g (0.026 mole) of methyl 5-benzoyl-indane-2-carboxylic dissolved in 40 cm³ of methanol. The mixture is heated at reflux temperature for 1 hour, the methanol evaporated and the mixture diluted with water; the alkaline mixture is then washed with ether and then acidified by the addition of hydrochloric acid. A precipitate forms which is filtered, washed with water and dried. After recrystallization from ethyl acetate the melting point is steady at 140°-142° C. (in a capillary tube).

Acid Value

Theoretical: 210; Found: 201.

Analysis

    ______________________________________                                                         C%       H%                                                    ______________________________________                                         Calculated        76.67      5.30                                              Found             76.65      5.21                                              ______________________________________                                    

Infra-red spectrum

μOH: 3100 to 2500 cm⁻¹

μCO: 1700 cm⁻¹

μCO: 1645 cm⁻¹

NMR Spectrum

1 acid proton at 11.66 ppm

Spread from 8 aromatic protons at 7.6 ppm

5 indan protons at 3.4 ppm

The following were also prepared by the methods described in Examples 1 and 2.

5-(4'-Chlorobenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₇ H₁₃ ClO₃

Melting point=183.5°-185° C. (capillary tube)

Acid Value

Theoretical=186; Found=170.

Analysis

    ______________________________________                                                      C%      H%       Cl%                                              ______________________________________                                         Calculated     67.89     4.36     11.79                                        Found          68.0      4.58     11.63                                        ______________________________________                                    

Infra-red spectrum

μCO acidic: 1695 cm⁻¹

μCO ketonic: 1650 cm⁻¹

Two adjacent aromatic hydrogen atoms: 840 cm⁻¹

Methyl ester:

Empirical formula C₁₈ H₁₅ Cl O₃

Melting point=79°-80° C. (capillary tube)

Boiling point at 0.3

torr: 185° C.

Analysis

    ______________________________________                                                      C%      H%       Cl%                                              ______________________________________                                         Calculated     68.68     4.80     11.26                                        Found          68.44     4.87     11.50                                        ______________________________________                                    

Infrared spectrum:

μCO at 1720 cm⁻¹

5-(4'-Methylbenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₈ H₁₆ O₃

Melting point=166°-168° C. (capillary tube)

Infrared spectrum:

μCO: 1700-1650 cm⁻¹

Analysis

    ______________________________________                                                         C%       H%                                                    ______________________________________                                         Calculated        77.13      5.75                                              Found             76.99      5.95                                              ______________________________________                                    

5-(3'-CHLOROBENZOYL)-INDAN-2-CARBOXYLIC ACID

Empirical formula C₁₇ H₁₃ Cl O₃

Melting point=127°-128° C. (capillary tube)

Acid Value:

Theoretical=186; Found=166

Infrared spectrum:

μCO: 1730 cm⁻¹

μCO: 1650 cm⁻¹

Analysis:

    ______________________________________                                                      C%      H%       Cl%                                              ______________________________________                                         Calculated     67.89     4.36     11.79                                        Found          67.90     4.40     11.84                                        ______________________________________                                    

5-(3'-METHYLBENZOYL)-INDAN-2-CARBOXYLIC ACID

Empirical formula C₁₈ H₁₆ O₃

Melting point=96°-99° C. (capillary tube)

Acid Value:

Theoretical=200; Found=198.

Infrared spectrum:

μCO=1730 cm⁻¹

μCO=1655 cm⁻¹

Analysis:

    ______________________________________                                                         C%       H%                                                    ______________________________________                                         Calculated        77.13      5.75                                              Found             76.98      5.98                                              ______________________________________                                    

The ethyl ester:

Boiling point at 0.45 torr=190° C.

n_(D) 19.5:1.5769

Infrared spectrum:

μCO ester: 1740 cm⁻¹

μCO ketone: 1660 cm⁻¹

Methyl 5-(4'-nitrobenzoyl)-indan-2-carboxylate

Empirical formula C₁₈ H₁₅ NO₅

Melting point: 126°-128° C. (capillary tube)

Infrared spectrum:

μCO acid: 1740 cm⁻¹

μCO ketone: 1660 cm⁻¹

Two adjacent aromatic hydrogen atoms: 850 cm⁻¹

Analysis:

    ______________________________________                                                      C%      H%       N%                                               ______________________________________                                         Calculated     66.45     4.65     4.31                                         Found          66.60     4.60     4.36                                         ______________________________________                                    

5-(2'-METHYLBENZOYL)-INDAN-2-CARBOXYLIC ACID

Empirical formula C₁₈ H₁₆ O₃

Melting point=110°-112° C. (capillary tube)

Acid Value:

Calculated=200; Found=204.

Infrared spectrum:

μCO acid=1710 cm⁻¹

μCO ketone=1660 cm⁻¹

Four adjacent aromatic hydrogen atoms: 755 cm⁻¹

Analysis:

    ______________________________________                                                         C%       H%                                                    ______________________________________                                         Calculated        77.13      5.75                                              Found             76.96      6.03                                              ______________________________________                                    

Methyl 5-(2'-furoyl)-indan-2-carboxylate

Empirical formula C₁₆ H₁₄ O₄

Melting point=84°-87° C. (capillary tube)

Infrared spectrum:

μCO ester: 1730 cm⁻¹

μCO ketone: 1640 cm⁻¹

Analysis:

    ______________________________________                                                         C%       H%                                                    ______________________________________                                         Calculated        71.10      5.22                                              Found             71.11      5.09                                              ______________________________________                                    

5-(4'-FLUOROBENZOYL)-INDAN-2-CARBOXYLIC ACID

Empirical formula C₁₇ H₁₃ FO₃

Melting point=163°-165° C. (capillary tube)

Acid Value: Calculated=197.5; Found=197. Infrared spectrum:

μCO acid=1710 cm⁻¹

μCO ketone=1650 cm⁻¹

Analysis:

    ______________________________________                                                      C%      H%       F%                                               ______________________________________                                         Calculated     71.81     4.61     6.68                                         Found          71.95     4.48     6.49                                         ______________________________________                                    

Methyl ester

Boiling point at 1.1 torr=185°-190° C. n_(D) ²¹ =1.5800

5-(2'-CHLOROBENZOYL)-INDAN-2-CARBOXYLIC ACID

Empirical formula C₁₇ H₁₃ Cl O₃

Melting point=128°-130° C. (capillary tube)

Acid value:

Calculated=186 Found=183

Infrared spectrum:

μCO acid: 1700 cm⁻¹

μCO ketone: 1680 cm⁻¹

Analysis:

    ______________________________________                                                  C%          H%     Cl%                                                ______________________________________                                         Calculated 67.89         4.36   11.79                                          Found      67.79         4.39   11.88                                          ______________________________________                                    

The ethyl ester:

Melting point at 0.6 to 0.5 torr is 198°-200° C. n_(D) ²¹ =1.588

Methyl 5-(2',4'-dichlorobenzoyl)-indan-2-carboxylate

Empirical formula C₁₈ H₁₄ Cl₂ O₃

Melting point=104°-105° C. (capillary tube)

Infrared spectrum:

μCO ester=1730 cm⁻¹

μCO ketone=1670 cm⁻¹

Analysis:

    ______________________________________                                                  C%          H%     Cl%                                                ______________________________________                                         Calculated 61.9          4.04   20.31                                          Found      62.06         4.08   20.37                                          ______________________________________                                    

5-CINNAMOYL-INDAN-2-CARBOXYLIC ACID

Empirical formula C₁₉ H₁₆ O₃

Melting point=170°-171° C. (capillary tube)

Infrared spectrum:

μCO acid: 1720 cm⁻¹

μCO ketone: 1655 cm⁻¹

NMR spectrum:

Spread from 11 protons centered around 7.6 ppm

Peak from 5 indan protons at 3.25 ppm

Analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   78.07           5.52                                              Found        77.99           5.56                                              ______________________________________                                    

The ethyl ester C₂₁ H₂₀ O₃

Boiling point at 1.5 torr=200° C. n_(D) ¹⁹ =1.6082

Infrared spectrum

μCO ester=1740 cm⁻¹

μCO ketone=1670 cm⁻¹

5-(Cyclohexylcarbonyl)-indan-2-carboxylic acid

Empirical formula C₁₇ H₂₀ O₃

Melting point=117°-119° C. (capillary tube)

NMR Spectrum:

One acidic proton at about 8.3 ppm

A multiplet from 2 aromatic protons centered at around 7.6 ppm

A doublet from 1 aromatic proton centered on 7.2 ppm

A peak from 5 indan protons at 3.2 ppm

A spread from 11 cyclohexyl protons centered around 1.6 ppm

Analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   74.99           7.40                                              Found        74.99           7.38                                              ______________________________________                                    

Methyl ester C₁₈ H₂₂ O₃

Boiling point at 0.5 to 0.6 torr=140° to 147° C.

Infrared spectrum:

μCO ester=1740 cm⁻¹

μCO ketone=1680 cm⁻¹

NMR spectrum

A multiplet from 2 aromatic protons at 7.65 ppm

A doublet from 1 aromatic proton at 7.2 ppm

A peak from 3 methoxy protons at 3.7 ppm

A peak from 5 indan protons at 3.2 ppm

A spread from 11 cyclohexyl protons at 1.6 ppm

METHYL 5-(2'-THENOYL)-INDAN-2-CARBOXYLATE

Empirical formula C₁₆ H₁₄ O₃ S

Boiling point at 1-1.5 torr=196° to 220° C.

Melting point=75°-77° C.

Infrared spectrum:

μCO ester=1730 cm⁻¹

μCO ketone=1630 cm⁻¹

NMR spectrum:

A multiplet from 4 aromatic protons at 7.7 ppm

A multiplet from 2 aromatic protons at 7.2 ppm

A peak from 3 methoxy protons at 3.7 ppm

A peak from 3 indan protons at 3.3 ppm

Analysis:

    ______________________________________                                                  C%          H%     S%                                                 ______________________________________                                         Calculated 67.13         4.93   11.20                                          Found      67.05         4.89   11.09                                          ______________________________________                                    

5-(2'-thenoyl)-indan-2-carboxylic acid

Empirical formula C₁₅ H₁₂ O₃ S

Melting point=117.5°-119° C. (capillary tube)

Infrared spectrum:

μCO acid: 1700 cm⁻¹

μCO ketone: 1630 cm⁻¹

NMR spectrum:

A proton from acidic OH around 11.15 ppm

A spread from 4 aromatic protons at 7.7 ppm

A spread from 2 aromatic protons at 7.2 ppm

A peak from 5 indan protons at 3.4 ppm

Analysis:

    ______________________________________                                                  C%          H%     S%                                                 ______________________________________                                         Calculated 66.15         4.44   11.78                                          Found      66.22         4.23   11.81                                          ______________________________________                                    

Methyl 5-phenacetyl-indan-2-carboxylate

Empirical formula C₁₉ H₁₈ O₃

Melting point=82°-84° C. (capillary tube)

Infrared spectrum:

μCO ester=1730 cm⁻¹

μCO ketone=1680 cm⁻¹

NMR Spectrum

A multiplet from 2 aromatic protons=7.7 ppm

A spread from 6 aromatic protons=7.15 ppm

A peak from 2 methylene protons=4.1 ppm

A peak from 3 methoxy protons=3.65 ppm

A peak from 5 indan protons=3.2 ppm

Analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   77.54           6.15                                              Found        77.58           6.08                                              ______________________________________                                    

5-(2',5'-dichlorobenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₇ H₁₂ Cl₂ O₃

Melting point=139°-141° C. (capillary tube)

Acid value:

Calculated=167; Found=166.5.

Infrared spectrum

μCO acid=1695 cm⁻¹

μCO ketone=1665 cm⁻¹

NMR spectrum

A spread from 1 acidic proton at 8 ppm

A multiplet from 6 aromatic protons at 7.4 ppm

A peak from 5 indan protons at 3.25 ppm

Analysis

    ______________________________________                                                  C%          H%     Cl%                                                ______________________________________                                         Calculated 60.91         3.61   21.15                                          Found      60.96         3.60   20.99                                          ______________________________________                                    

The methyl ester

Empirical Formula C₁₈ H₁₄ Cl₂ O₃

Boiling point at 0.6-0.7 torr=200° at 215° C.

Infrared spectrum:

μCO ester: 1740 cm⁻¹

μCO ketone: 1670 cm⁻¹

NMR spectrum:

One aromatic proton at 7.6 ppm

A spreak from 5 aromatic protons at 7.3 ppm

A peak from 3 methoxy protons at 3.65 ppm

A peak from 5 indan protons at 3.2 ppm

Methyl 5-nicotinoyl-indan-2-carboxylate

Empirical formula C₁₇ H₁₅ NO₃

Boiling point at 0.6 torr=200° C.

Melting point=68.5°-70.5° C.

Infrared spectrum:

μCO ester=1740 cm⁻¹

μCO ketone=1650 cm⁻¹

NMR spectrum

A spread from 1 aromatic proton at 9.1 ppm

A multiplet from 1 aromatic proton at 9 ppm

A multiplet from 1 aromatic proton at 8.1 ppm

A multiplet from 4 aromatic protons at 7.5 ppm

A peak from 3 methoxy protons at 3.7 ppm

A peak from 5 indan protons at 3.3 ppm

Analysis:

    ______________________________________                                                  C%          H%     N%                                                 ______________________________________                                         Calculated 72.58         5.38   4.98                                           Found      72.53         5.39   4.98                                           ______________________________________                                    

Methyl 5-(3'-thenoyl)-indan-2-carboxylate

Empirical formula C₁₆ H₁₄ O₃ S

Boiling point at 0.9 torr=200°-210° C. Melting point=77.5° to 79° C.

Infrared spectrum:

μCO ester=1740 cm⁻¹

μCO ketone=1640 cm⁻¹

NMR spectrum

A multiplet from 1 aromatic proton at 7.9 ppm

A multiplet from 3 aromatic protons at 7.6 ppm

A multiplet from 2 aromatic protons at 7.3 ppm

A peak from 3 methoxy protons at 3.7 ppm

A peak from 5 indan protons at 3.3 ppm

Analysis

    ______________________________________                                                  C%          H%     S%                                                 ______________________________________                                         Calculated 67.13         4.93   11.20                                          Found      67.08         5.06   11.14                                          ______________________________________                                    

5-(3'-thenoyl)-indan-2-carboxylic acid

Empirical formula C₁₅ H₁₂ O₃ S

Melting point=128.5° to 130° C. (capillary tube)

Infrared spectrum:

μOH=3500 to 3100 cm⁻¹

μCO acid=1715 cm⁻¹

μCO ketone=1650 cm⁻¹

NMR spectrum

A multiplet from 1 aromatic proton at 8 ppm

A multiplet from 3 aromatic protons at 7.65 ppm

A multiplet from 2 aromatic protons at 7.35 ppm

A spread from 5 indan protons at 3.4 ppm

Analysis:

    ______________________________________                                                  C%          H%     S%                                                 ______________________________________                                         Calculated 66.15         4.44   11.78                                          Found      66.08         4.44   11.75                                          ______________________________________                                    

5-(4'-Aminobenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₇ H₁₅ NO₃

Melting point=212°-213° C. (capillary tube)

Infrared spectrum:

μNH=3460-3350 cm⁻¹

μCO=1690 cm⁻¹

NMR spectrum

A spread from 5 aromatic protons around 7.4 ppm

A doublet from 2 aromatic protons around 6.6 ppm

A spread from 5 indan protons around 3.2 ppm

Analysis:

    ______________________________________                                                   C%         H%     N%                                                 ______________________________________                                         Calculated 72.58         5.38   4.98                                           Found      72.49         5.53   4.89                                           ______________________________________                                    

The methyl ester C₁₈ H₁₇ NO₃

Melting point: 98°-100° C. (capillary tube)

Infrared spectrum

μNH=3450-3350-3240 cm⁻¹

μCO ester=1730 cm⁻¹

μCO ketone=1640 cm⁻¹

NMR Spectrum

A multiplet from 5 aromatic protons at 7.5 ppm

A doublet from 2 aromatic protons at 6.6 ppm

A spread from 2 amine protons at 5.5 ppm

A peak from 3 methoxy protons at 3.7 ppm

A spread from 5 indan protons at 3.3 ppm

5-(4'-Phenylbenzoyl)-indan-2-carboxylic acid

Empirical formula C₂₃ H₁₈ O₃

Melting point: 187°-189° C. (capillary tube)

Infrared spectrum:

μCO acid=1700 cm⁻¹

μCO ketone=1645 cm⁻¹

Five adjacent aromatic hydrogen atoms=700-750 cm⁻¹

NMR spectrum:

Multiplet from 12 aromatic protons at 7.6 ppm

Peak from 5 indan protons at 3.35 ppm

Percentage analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   80.69           5.30                                              Found        80.43           5.43                                              ______________________________________                                    

5-(3'-Methoxybenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₈ H₁₆ O₄

Melting point=126°-128° C. (capillary tube)

Acid Value: Calculated=188; Found=184. Infrared spectrum

μCO acid=1720 cm⁻¹

μCO ketone=1680 cm⁻¹

NMR spectrum

A multiplet from 2 aromatic protons at 7.65 ppm

A multiplet from 5 aromatic protons at 7.3 ppm

A spread from 1 hydroxylic proton at 10.7 ppm

A peak from 3 methoxy protons at 3.85 ppm

A peak from 5 indan protons at 3.4 ppm

Analysis

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   72.96           5.44                                              Found        73.03           5.47                                              ______________________________________                                    

The methyl ester C₁₉ H₁₈ O₄

Boiling point at 0.9-1.1 torr=225° to 240° C.

5-(2'-Methoxybenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₈ H₁₆ O₄

Melting point: 128° to 130° C. (capillary tube)

Infrared spectrum:

μCO acid=1700 cm⁻¹

μCO ketone=1650 cm⁻¹

Four adjacent aromatic hydrogen atoms=750 cm⁻¹

NMR spectrum:

A multiplet from 7 aromatic protons between 7 and 7.8 ppm

A spread from 1 hydroxylic proton at 10.3 ppm

A peak from 2 methoxy protons at 3.7 ppm

A spread from 5 indan protons at 3.35 ppm

Analysis

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   72.96           5.44                                              Found        72.98           5.38                                              ______________________________________                                    

5-(2'-Furoyl)-indan-2-carboxylic acid

Empirical formula C₁₅ H₁₂ O₄

Melting point=168.5°-170.5° C. (capillary tube)

Infrared spectrum

μCO acid: 1695 cm⁻¹

μCO ketone: 1630 cm⁻¹

NMR spectrum:

A spread from 1 acid proton at 9.6 ppm

A multiplet from 3 aromatic protons at 7.8 ppm

A multiplet from 2 aromatic protons at 7.4 ppm

A multiplet from 1 aromatic proton at 6.6 ppm

A spread from 5 indan protons at 3.35 ppm

Analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   70.29           4.72                                              Found        70.03           5.11                                              ______________________________________                                    

5-(3'-Furoyl)-indan-2-carboxylic acid

Empirical formula C₁₅ H₁₂ O₄

Melting point=125°-126.5° C. (capillary tube)

Infrared spectrum:

μCO acid=1700 cm⁻¹

μCO ketone=1645 cm⁻¹

NMR Spectrum:

A spread from 1 acidic proton at 10 ppm

A multiplet from 1 aromatic proton at 7.95 ppm

A multiplet from 2 aromatic protons at 7.7 ppm

A multiplet from 1 aromatic proton at 7.55 ppm

A multiplet from 1 aromatic proton at 7.35 ppm

A multiplet from 1 aromatic proton at 6.9 ppm

A spread from 5 indan protons at 3.4 ppm

Analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   70.29           4.72                                              Found        69.86           4.93                                              ______________________________________                                    

The methyl ester

Empirical formula C₁₆ H₁₄ O₄

Boiling point at 0.8-0.6 torr=140° to 170° C.

Infrared spectrum:

μCO ester: 1735 cm⁻¹

μCO ketone: 1645 cm⁻¹

NMR spectrum:

A multiplet from 1 aromatic proton at 7.9 ppm

A multiplet from 2 aromatic protons at 7.65 ppm

A multiplet from 1 aromatic proton at 7.5 ppm

A multiplet from 1 aromatic proton at 7.3 ppm

A multiplet from 1 aromatic proton at 6.85 ppm

A peak from 3 methoxy protons at 3.75 ppm

A spread from 5 indan protons at 3.3 ppm

5-(4'-Ethoxybenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₉ H₁₈ O₄

Melting point: 140°-142° C. (capillary tube)

Infrared spectrum:

μCO acid: 1700 cm⁻¹

μCO ketone: 1645 cm⁻¹

NMR spectrum:

A peak from 1 acidic proton at 11 ppm

A doublet from 2 aromatic protons at 7.85 ppm

A multiplet from 2 aromatic protons at 7.6 ppm

A multiplet from 1 aromatic proton at 7.3 ppm

A doublet from 2 aromatic protons at 6.85 ppm

A quadruplet from ethyl group at 4.1 ppm

A spread from 5 indan protons at 3.35 ppm

A triplet from ethyl group at 1.5 ppm

Analysis:

    ______________________________________                                                    C%            H%                                                    ______________________________________                                         Calculated   73.54           5.85                                              Found        73.16           5.88                                              ______________________________________                                    

The methyl ester

Empirical formula C₂₀ H₂₀ O₄

Boiling point at 0.8 torr=225° to 230° C.

Infrared spectrum:

μCO ester=1730 cm⁻¹

μCO ketone=1640 cm⁻¹

5-(3',4'-Dichlorobenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₇ H₁₂ Cl₂ O₃

Melting point=166°-168° C. (capillary tube)

Infrared spectrum:

μCO acid: 1710 cm⁻¹

μCO ketone: 1655 cm⁻¹

NMR spectrum:

A multiplet from 1 aromatic proton at 7.85 ppm

A multiplet from 6 protons at 7.5 ppm

A spread from 5 indan protons at 3.35 ppm

Analysis:

    ______________________________________                                                  C%          H%     Cl%                                                ______________________________________                                         Calculated 60.91         3.61   21.15                                          Found      60.93         3.63   21.09                                          ______________________________________                                    

The methyl ester

Empirical formula C₁₈ H₁₄ Cl₂ O₃

Boiling point at 0.9-1.2 torr=220°-240° C.

Infrared spectrum:

μCO ester: 1745 cm⁻¹

μCO ketone: 1665 cm⁻¹

NMR spectrum:

A multiplet from 1 aromatic proton at 7.9 ppm

A multiplet from 5 aromatic protons at 7.5 ppm

A peak from 3 methoxy protons at 3.8 ppm

A peak from 5 indan protons at 3.35 ppm

5-(5'-Methyl-2'-thenoyl)-indan-2-carboxylic acid

Empirical formula C₁₆ H₁₄ O₃ S

Melting point=165°-166° C. (capillary tube)

Infrared spectrum:

μCO: 1710 cm⁻¹

NMR spectrum:

A spread from 1 acid proton at 9.5 ppm

A multiplet from 2 aromatic protons at 7.65 ppm

A multiplet from 2 aromatic protons at 7.45 ppm

A multiplet from 1 aromatic proton at 6.8 ppm

A spread from 5 indan protons at 3.35 ppm

A peak from 3 methyl protons at 2.6 ppm

Analysis:

    ______________________________________                                                  C%          H%     S%                                                 ______________________________________                                         Calculated 67.13         4.93   11.20                                          Found      67.10         4.99   11.08                                          ______________________________________                                    

The methyl ester

Empirical formula C₁₇ H₁₆ O₃ S

Boiling point at 0.3 torr=190°-210° C.

Infrared spectrum:

μCO ester: 1745 cm⁻¹

μCO ketone: 1640 cm⁻¹

NMR spectrum

A multiplet from 2 aromatic protons at 7.65 ppm

A multiplet from 2 aromatic protons at 7.4 ppm

A multiplet from 1 aromatic proton at 6.8 ppm

A peak from 3 methoxy protons at 3.7 ppm

A spread from 5 indan protons at 3.35 ppm

A peak from 3 methyl protons at 2.55 ppm

5-(5'-Chloro-2'-thenoyl)-indan-2-carboxylic acid

Empirical formula C₁₅ H₁₁ Cl O₃ S

Melting point=140°-141° C. (capillary tube)

Infrared spectrum:

μCO acid: 1710 cm⁻¹

μCO ketone: 1630 cm⁻¹

NMR spectrum:

A spread from 1 acid proton at 9.5 ppm

A multiplet from 2 aromatic protons at 7.6 ppm

A multiplet from 2 aromatic protons at 7.4 ppm

A doublet from 1 aromatic proton at 6.95 ppm

A spread from 5 indan protons at 3.35 ppm

Analysis:

    ______________________________________                                                 C%        H%     Cl%        S%                                         ______________________________________                                         Calculated                                                                               58.72       3.61   11.56    10.45                                    Found     58.86       3.48   11.61    10.45                                    ______________________________________                                    

The methyl ester

Empirical formula C₁₆ H₁₃ Cl O₃ S

Boiling point at 0.3-0.35 torr=200°-210° C.

Infrared spectrum:

μCO ester: 1740 cm⁻¹

μCO ketone: 1635 cm⁻¹

NMR spectrum:

A multiplet from 2 aromatic protons at 7.6 ppm

A multiplet from 2 aromatic protons at 7.4 ppm

A doublet from 1 aromatic proton at 6.95 ppm

A peak from 3 methoxy protons at 3.7 ppm

A spread from 5 indan protons at 3.35 ppm

5-(4'-Acetamidobenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₉ H₁₇ NO₄

Melting point=204°-205° C. (capillary tube)

Infrared spectrum:

μNH: 3340 cm⁻¹

μCO acid: 1720 cm⁻¹

μCO: 1650 cm⁻¹

NMR spectrum:

A peak from 4 aromatic protons at 7.7 ppm

A multiplet from 3 aromatic protons at 7.4 ppm

A spread from 5 indan protons at 3.35 ppm

A peak from 3 methyl protons at 2.2 ppm

Analysis:

    ______________________________________                                                  C%          H%     N%                                                 ______________________________________                                         Calculated 70.58         5.30   4.33                                           Found      70.56         5.49   4.29                                           ______________________________________                                    

The methyl ester

Empirical formula C₂₀ H₁₉ NO₄

Melting point: 139°-140° C. (capillary tube)

Infrared spectrum:

μNH: 3250 cm⁻¹

μCO ester: 1730 cm⁻¹

μCO: 1650 cm⁻¹

EXAMPLE NO. 3 5-(4'-Methoxybenzoyl)-indan-2-carboxylic acid ##STR13## (a) 4-(4'-Methoxybenzoyl)-1,2-dimethylbenzene

Empirical formula C₁₆ H₁₆ O₂

The following are successively added to a 500 cm³ reaction vessel fitted with a stirrer and cooler: 135 g (1.272 mole) of orthoxylene, 1.27 g of zinc oxide and 108.5 g (0.636 mole) of 4-methoxybenzoyl chloride. The mixture is heated to reflux for four hours, the resulting reaction mixture is dissolved in water and soda and extracted with benzene. The benzene extract is dried over anhydrous sodium sulphate, filtered, the filtrate concentrated and the residue distilled. The fraction collected has a boiling point of 185° C. at 0.75 torr.

(b) 4-(4'-methoxybenzoyl)-1,2-bis(bromomethyl)benzene

Empirical formula C₁₆ H₁₄ Br₂ O₂

The following are successively added to a 2 liter reaction vessel fitted with a stirrer, a cooler, a dropping funnel and a thermometer: 100.2 g (0.425 mole) of 4-(4'-methoxybenzoyl)-1,2-dimethylbenzene, 166 g (0.425 mole+10%) of N-bromosuccinimide and 565 cm³ of carbon tetrachloride. The mixture is heated to reflux and 17 g of α,α'-azobisisobutyronitrile is introduced in small quantities. Reflux is continued for 30 minutes, the precipitate which forms is filtered and the filtrate is concentrated. In this way there is obtained a thick oil which is used as prepared in the next stage.

(c) Ethyl 5-(4'-methoxybenzoyl)-indan-2,2-dicarboxylate

Empirical formula C₂₃ H₂₄ O₆

The following are successively added to a 2 liter reaction vessel equipped with a stirrer, a cooler and a dropping funnel: 210 cm³ of ethyl carbonate, 50.5 g (0.850 mole+10%) of sodium methylate, and 68 g (0.425 mole) of ethyl malonate. A rise in temperature is observed. The reaction is allowed to continue for 30 minutes and then 169 g (0.425 mole) of 4-(4'-methoxybenzoyl)-1,2-bis(bromomethyl)benzene in solution in 425 cm³ of ethyl carbonate is added. The mixture is heated to reflux for nine hours, allowed to cool and diluted with acidified water. The ethyl carbonate phase is decanted, dried over anhydrous sodium sulphate, filtered and the filtrate concentrated. The crude substance thus obtained is used as it is for the next stage of the process.

(d) 5-(4'-methoxybenzoyl)-indan-2,2-dicarboxylic acid

Empirical formula C₁₉ H₁₆ O₆

168 g (0.425 mole) of ethyl 5-(4'-methoxybenzoyl)-indane-2,2-dicarboxylate, 1200 cm³ of ethanol, and 119 g (2.125 mole) of potash dissolved in 740 cm³ of water are placed in a 2 liter reaction vessel equipped with a stirrer and cooler. The mixture is heated to reflux for 45 minutes, the alcohol is evaporated, the resulting mixture is diluted with water and the mixture then washed with ether under alkaline conditions. The mixture is then acidified, extracted with ether and the extract dried over anhydrous sodium sulphate, filtered and the filtrate concentrated. A doughy solid is obtained which is used as prepared for the next stage of the process.

(e) 5-(4'-methoxybenzoyl)-indan-2-carboxylic acid

Empirical formula C₁₈ H₁₆ O₄

77.5 g (0.228 mole) of the crude acid obtained in (d) and 1070 cm³ of concentrated hydrochloric acid are placed in a 2 liter reaction vessel equipped with a stirrer and cooler. The mixture is heated to reflux for 15 hours. After cooling, the reaction mixture is extracted with diethyl ether, the extract dried over anhydrous sodium sulphate, filtered, and the filtrate concentrated. A doughy solid is obtained which, after recrystallization from ethyl acetate, melts at 149°-151° C. (capillary tube). If difficulty is experienced in purifying the acid by recrystallization, the methyl ester of the acid may first be formed, for example, and purified by distillation (boiling point at 0.67 torr=218° C.) and then hydrolyzed with aqueous alcoholic potash using a known method. The acid obtained is thus more easily able to be purified.

Acid Value:

Theoretical=189; Found=186.

Infrared spectrum:

μCO acid: 1710 cm⁻¹

μCO ketone: 1650 cm⁻¹

Analysis:

    ______________________________________                                                    C%          H%                                                      ______________________________________                                         Calculated   72.96         5.44                                                Found        73.10         5.48                                                ______________________________________                                    

EXAMPLE NO. 4 N-(2'-hydroxyethyl) 5-benzoyl-indan-2-carboxamide ##STR14##

6.2 g (0.084 mole+20%) of monoethanolamine dissolved in 30 cm³ of dioxane is placed in a 250 cm³ reaction vessel equipped with a stirrer, a cooler, a dropping funnel and a thermometer. At a temperature of between 15° and 20° C., a solution of 12.2 g (0.042 mole) of 5-benzoyl-indan-2-carboxylic acid chloride (prepared in conventional manner by reacting thionyl chloride with the corresponding acid) in 30 cm³ of dioxane is slowly added. The reaction mixture is stirred for one hour at ambient temperature and then poured into iced, acidified water. A whitish oil separates and finally crystallizes. Upon recrystallization from acetone, a solid which melts at 106°-107° C. (capillary tube) is obtained.

Infrared spectrum:

μNH--OH: 3300 cm⁻¹

μCO: 1640 cm⁻¹

Five adjacent aromatic hydrogen atoms: 695-725 cm⁻¹

Analysis:

    ______________________________________                                                   C%       H%         N%                                               ______________________________________                                         Calculated  73.77      6.19       4.53                                         Found       73.89      6.16       4.44                                         ______________________________________                                    

EXAMPLE NO. 5 2'-(N,N-diethylaminoethyl) 5-benzoyl-indan-2-carboxylate ##STR15##

The following are added successively to a 250 cm³ reaction vessel equipped with a stirrer, a cooler and a dropping funnel: 11.5 g (0.043 mole) of 5-benzoyl-indan-2-carboxylic acid, 110 cm³ of isopropanol, 7.15 g (0.043 mole+20%) of potassium carbonate and 7.40 g (0.043 mole) of 2-chloroethyldiethylamine hydrochloride dissolved in 70 cm³ of isopropanol. The mixture is heated to reflux for 15 hours. After cooling, the isopropanol is removed under reduced pressure and the resulting mixture diluted with water and washed with ether under acid conditions. The aqueous phase is basified and then extracted with diethyl ether. The extract is dried over sodium sulphate, filtered and the filtrate concentrated. Distillation of the residue gives a thick oil (boiling point at 0.5 torr=210°-220° C.). By forming the oxalate, a solid is obtained which, after recrystallization from a mixture of acetone and ethanol, melts at 141°-143° C. (capillary tube).

Acid value:

Calculated 244; Found 239.

Infrared spectrum

μCO ester: 1735 cm⁻¹

μCO ketone: 1655 cm⁻¹

Analysis:

    ______________________________________                                                   C%       H%         N%                                               ______________________________________                                         Calculated  65.92      6.42       3.08                                         Found       65.88      6.30       3.10                                         ______________________________________                                    

EXAMPLE NO. 6 2'-(N-cinnamoylaminoethyl) 5-benzoyl-indan-2-carboxylate ##STR16##

The following are successively added to a 250 cm³ reaction vessel equipped with a stirrer and a cooler: 5.55 g (0.029 mole) of N-(2'-hydroxyethyl)cinnamamide, 70 cm³ of benzene, 8.25 g (0.029 mole) of 5-benzoyl-indan-2-carboxylic acid chloride, and 3.1 g (0.029 mole+5%) of triethylamine. The mixture is heated to reflux for six hours. The reaction mixture is then poured into water and extracted with benzene. The extract is dried over anhydrous sodium sulphate, filtered, the filtrate concentrated and the residue obtained recrystallized from a mixture of ethyl acetate and hexane to give a solid which melts at 117.5°-118° C. (capillary tube).

Infrared spectrum

μNH: 3280 cm⁻¹

μCO ester: 1735 cm⁻¹

μCO: 1650 cm⁻¹

Five adjacent aromatic hydrogen atoms: 730-700 cm⁻¹

NMR spectrum:

Spread from 13 aromatic protons+CH=CH trans proton around 7.5 ppm.

A doublet from 1 CH=CH trans proton: 6.42 ppm

A proton from NH: 6.3 ppm

A triplet from two methylene protons: 4.4 ppm

A triplet from two methylene protons: 3.8 ppm

Five indan protons: 3.35 ppm

Analysis:

    ______________________________________                                                   C%       H%         N%                                               ______________________________________                                         Calculated  76.51      5.73       3.19                                         Found       76.43      5.93       3.13                                         ______________________________________                                    

EXAMPLE NO. 7 4'-Benzoylorthoxylene ##STR17##

As an alternative to the zinc oxide procedure described in the literature, the following procedure may be adopted: in a 250 cm³ reaction vessel equipped with a cooler, a dropping funnel and a nitrogen discharge tube, a Grignard solution is prepared from: 4.7 g (0.234 mole) of magnesium, 43.3 g (0.234 mole) of 4-bromo-orthoxylene and 150 cm³ of tetrahydrofurane. When the magnesium has dissolved, 29.8 g (0.212 mole) of benzoyl chloride dissolved in 100 cm³ of tetrahydrofurane is added to the solution at 0° C. The mixture is left to stand for one hour at 0° C. and for eighteen hours at ambient temperature and then, after hydrolysis in known manner and extraction with diethyl ether, drying over sodium sulphate, filtration, concentration and distillation of the residue, an oil is obtained, the properties of which agree with those described in the literature.

EXAMPLE NO. 8 5-(3'-Methyl-2'-thenoyl)-indan-2-carboxylic acid ##STR18## (a) Methyl 5-(3'-methyl-2'-thenoyl)-indan-2-carboxylate

Empirical formula C₁₇ H₁₆ O₃ S

18 g (0.139 mole) aluminum chloride is introduced into a 250 cc reactor equipped with a stirrer, a cooler fitted with a calcium chloride trap, a dropping funnel, and a thermometer, and 14.1 g (0.08 mole) methyl indan-2-carboxylate is added drop by drop through the dropping funnel. When this is complete, the temperature reaches 35° C. The mixture is heated slightly for homogenization. Then, 12.8 g (0.08 mole) 3-methylthiophene-2-carboxylic acid chloride are added drop by drop at about 20° C. The mixture is heated gradually to about 70° to 80° C. It is kept at this temperature for 30 minutes then allowed to cool to 40° C. At this time, methylene chloride is added, then the solution obtained is poured into ice water to which hydrochloric acid has been added. The organic phase is decanted, and washed with soda water, then water. It is dried on sodium sulfate, and filtered; the filtrate is concentrated and the residue is distilled. A thick oily fraction, Eb₀.7 torr: 180°-200° C., is recovered.

Infrared spectrum:

-νCO: 1740 cm⁻¹

-νCO: 1640 cm⁻¹

NMR Spectrum

-clump of 5 aromatic protons centered at about 7.4 ppm

-peak of 3 OCH₃ protons at 3.4 ppm

-peak of 5 indan protons at 3.33 ppm

-peak of 3 CH₃ protons at 2.4 ppm.

(b) Conversion to 5-(3'-methyl-2'-thenoyl)-indan-2-carboxylic acid

The following are introduced successively into a 250 cc reactor equipped with a stirrer and cooler:

-6.7 g (0.0223 mole) of the ester obtained by step (a), dissolved in 30 cc methanol, and

-2.8 g (0.05 mole) of potash dissolved in 30 cc methanol. The mixture is refluxed for an hour. It is concentrated until dry, dissolved in water, and washed with ether in an alkaline medium. The aqueous phase is acidified while cold by hydrochloric acid; a solid precipitates. It is filtered with suction, washed with water, and dried.

By recrystallization in ethyl acetate, a solid melting at 136°-138° C. (capillary tube) is obtained.

Infrared Spectrum

-νCO: 1700 cm⁻¹

-νCO: 1635 cm⁻¹

NMR Spectrum

-clump of aromatic protons centered at about 7.32 ppm

-peak of 5 indan protons at about 3.4 ppm

-peak of 3 methyl protons at 2.47 ppm

-peak of 1 OH proton at about 10.7 ppm.

Acidity Index

Experimental: 195

Calculated: 190

Percent Analysis

    ______________________________________                                                    C%      H%         S%                                               ______________________________________                                         Calculated   67.13     4.93       11.20                                        Experimental 67.06     4.99       11.24                                        ______________________________________                                    

EXAMPLE 9 5-(5'-Methyl-2'-furoyl)-indan-2-carboxylic acid ##STR19## (a) Methyl 5-(5'-methyl-2'-furoyl)-indan-2-carboxylate

Empirical formula C₁₇ H₁₆ O₄

The following are introduced into a 250 cc reactor equipped with a stirrer, a cooler fitted with a calcium chloride trap, a dropping funnel, and a thermometer:

-11.4 g (0.086 mole) aluminum chloride suspended in 30 cc methylene chloride, and

-5.5 g (0.0382 mole) 5-methylfuran-2-carboxylic acid chloride dissolved in 30 cc methylene chloride. The mixture is brought to 20° C. then a solution of 5.6 g (0.318 mole) methyl indan-2-carboxylate in 50 cc methylene chloride is added drop by drop.

The mixture is stirred for two hours at ambient temperature then refluxed for three hours. It is left to stand overnight and poured into a bath of slightly acid ice water. It is extracted with methylene chloride, the extract is washed with soda water and water, then dried on sodium sulfate and filtered; the filtrate is concentrated and the residue distilled. An

Eb₁ torr: 195°-205° C. fraction is recovered.

Infrared spectrum

-νCO: 1740 cm⁻¹

-νCO: 1645 cm⁻¹

NMR Spectrum

clump of 4 aromatic protons at about 7.33 ppm

1 aromatic proton at about 6.2 ppm

peak of 5 indan protons at 3.3 ppm

peak of 3 OCH₃ protons at 3.7 ppm

peak of 3 CH₃ protons at 2.47 ppm

(b) Conversion to 5-(5'-methyl-2'-furoyl)-indan-2-carboxylic acid

The following are introduced successively into a 50 cc reactor:

2.7 g (0.0095 mole) of the ester obtained by step (a), dissolved in 16.5 cc methanol, and

1.16 g (0.0208 mole) potash dissolved in 16.5 cc water.

The mixture is left to stand at ambient temperature for 48 hours. It is concentrated until dry, dissolved in water, washed with ether in an alkaline medium; then the aqueous phase is acidified. It is extracted with ether, dried on sodium sulfate, and filtered; the filtrate is concentrated. The residue obtained after recrystallization in an ethyl acetate-hexane mixture melts at 128°-130° C. (capillary tube).

Infrared Spectrum

-νCO: 1700 cm⁻¹

-νCO: 1635 cm⁻¹

NMR Spectrum

1 OH proton at about 10.6 ppm

clump of 4 aromatic protons centered at about 7.5 ppm

1 aromatic proton at about 6.8 ppm

5 indan protons at 3.36 ppm

3 CH₃ protons at 2.47 ppm

Percent Analysis

    ______________________________________                                                     C%         H%                                                      ______________________________________                                         Calculated    71.10        5.22                                                Experimental  70.99        5.16                                                ______________________________________                                    

EXAMPLE 10 5-(4'-dimethylaminobenzoyl)-indan-2-carboxylic acid ##STR20## (a) Methyl 5-(4'-dimethylaminobenzoyl)-indan-2-carboxylate

Empirical formula C₂₀ H₂₁ NO₃

One may proceed according to:

(a) The following are introduced into a 250 cc autoclave, 5 g (0.017 mole) methyl 5-(4'-aminobenzoyl)-indan-2-carboxylate, 100 cc ethanol, and 26 cc formaldehyde (36% in water) in the presence of 2 g Pd/C (5%). The mixture is heated to about 40° C. with stirring after charging the autoclave with hydrogen. After absorption of the theoretical quantity the mixture is filtered to eliminate the catalyst. The ethanol is concentrated in vacuo, dissolved in water, and extracted with ether. It is dried on sodium sulfate and filtered, and the filtrate is concentrated. The residue after recrystallization in an ethyl acetate-diisopropylether mixture melts at 87°-89° C. (capillary tube).

Infrared Spectrum

-νCO: 1740 cm⁻¹

-νCO: 1640 cm⁻¹

disappearance of NH₂ lines

    ______________________________________                                         NMR Spectrum                                                                   ______________________________________                                         doublet      2 aromatic protons:                                                                             7.85 ppm                                         multiplet    2 aromatic protons:                                                                             7.55 ppm                                         multiplet    1 aromatic proton:                                                                              7.25 ppm                                         doublet      2 aromatic protons:                                                                             6.7 ppm                                          peak         3 CH.sub.3 protons:                                                                             3.8 ppm                                          clump        5 indan protons: 3.35 ppm                                         peak         6 CH.sub.3 protons:                                                                             3.1 ppm                                          ______________________________________                                    

Percent Analysis

    ______________________________________                                                    C%      H%         N%                                               ______________________________________                                         Calculated   74.29     6.55       4.33                                         Experimental 74.41     6.60       4.42                                         ______________________________________                                    

(b) The following are introduced into a 125 cc autoclave, 9.6 g (0.068 mole) methyl iodide, 4.9 g (0.034 mole+5%) K₂ CO₃, 30 cc dimethylformamide and 5 g (0.017 mole) methyl 5-(4'-aminobenzoyl)-indan-2-carboxylate. The mixture is stirred for 24 hours. The dimethylformamide is evaporated in vacuo, dissolved in water, and extracted with ether. The mixture is dried on sulfate, filtered, and the filtrate concentrated. The residue obtained is recrystallized in an ethyl acetate-dissopropylether mixture. A substance is obtained whose physical and spectral characteristics are identical to those of the product of the substance obtained according to (a).

(c) Conversion to 5-(4'-dimethylaminobenzoyl)-indan-2-carboxylic acid

In the same manner as specified in Example 8 (b), the following are reacted:

5.6 g (0.0174 mole) methyl 5-(4'-dimethylaminobenzoyl)-indan-2-carboxylate, and

1.95 g (0.0348 mole) potash in 60 cc methanol.

A solid melting at 164°-165° C. (capillary tube) is obtained by recrystallization in ethyl acetate.

Infrared Spectrum

-νCO: 1730 cm⁻¹

-νCO: 1620 cm⁻¹

NMR Spectrum

clump of 7 aromatic protons centered at about 7.23 ppm

peak of 5 indan protons at 3.3 ppm

peak of 6 CH₃ protons at 3.1 ppm

Percent Analysis

    ______________________________________                                                    C%      H%         N%                                               ______________________________________                                         Calculated   73.77     6.19       4.53                                         Experimental 73.90     6.05       4.53                                         ______________________________________                                    

EXAMPLE 11 5-(p-methylsulfonylbenzoyl)-indan-2-carboxylic acid ##STR21##

(a) Methyl 5-(p-methylsulfonylbenzoyl)-indan-2-carboxylate is prepared according to Example 8 (a) from

14.5 g (0.107 mole) aluminum chloride,

11 g (0.0475 mole) p-methylsulfonyl benzoic acid chloride, both in 60 cc methylene chloride, and

7 g (0.0397 mole) methyl indan-2-carboxylate in 30 cc methylene chloride.

After concentrating and dissolving the residue in hexane, a solid is obtained which is used in its crude form.

(b) The corresponding acid is prepared according to Example 8 (b) from:

3 g (0.0084 mole) of the ester obtained from (a),

1.1 g (0.02 mole) potash, and

50 cc methanol.

A solid melting at 187°-190° C. (capillary tube) is obtained by recrystallization in ethanol.

Infrared Spectrum

-νCO: 1710 cm⁻¹

-νCO: 1670 cm⁻¹

NMR Spectrum

clump of 7 aromatic protons centered at about 7.8 ppm

peak of 5 indan protons at 3.33 ppm

peak of 3 CH₃ protons at 3.17 ppm

Acidity Index

Calculated: 163

Experimental: 155

Percent Analysis

    ______________________________________                                                    C%      H%         S%                                               ______________________________________                                         Calculated   62.78     4.68       9.31                                         Experimental 62.90     5.01       9.17                                         ______________________________________                                    

EXAMPLE 12 5-(p-sulfamidobenzoyl)-indan-2-carboxylic acid ##STR22## (a) Methyl 5-(p-chlorosulfonylbenzoyl)-indan-2-carboxylate

Empirical formula C₁₈ H₁₅ ClO₅ S

14.7 g (0.05 mole) methyl 5-(4'-aminobenzoyl)-indan-2-carboxylate are introduced into a 250 cc reactor with a stirrer, thermometer, and dropping funnel. At a temperature between 0°-10° C., 40 cc 24% hydrochloric acid is added, followed by a solution of 3.8 g sodium nitrite in 10 cc water added between 0° and 5° C.

The diazonium salt formed in this way is then added at about 15° C. to a stirred mixture of:

--80 cc acetic acid saturated with sulfur dioxide and

--2.8 g cupric chloride dissolved in 5 cc water.

The mixture is allowed to return to ambient temperature, heated to about 40° C. to finish the reaction, and left to stand overnight. The next day it is dissolved in ice water and the solid which precipitates is filtered with suction. The substance obtained is checked by NMR and IR spectrography.

(b) Conversion to methyl 5-(p-sulfamidobenzoyl)-indan-2-carboxylate ##STR23##

The following are introduced into a 500 cc reactor with stirrer, cooler, and dropping funnel:

--15.6 g (0.041 mole) of the derivative obtained in step (a), and

--150 cc chloroform.

Then, while stirring vigorously, 100 cc 15% ammonia are added. The mixture is stirred, for one hour and a half at ambient temperature. It is dissolved in water and chloroform. The chloroform phase is decanted, dried on sodium sulfate, filtered, and concentrated.

A solid melting at 147°-149° C. (capillary tube) is obtained by recrystallizing the residue in an ethyl acetate-diisopropyl ether mixture.

Infrared Spectrum

-νNH: 3400-3320 cm⁻¹

-νCO: 1745 cm⁻¹

-νCO: 1660 cm⁻¹

NMR Spectrum

clump of 7 aromatic protons at about 7.66 ppm

peak of 2 NH₂ protons at 6.1 ppm

peak of 3 OCH₃ protons at 3.7 ppm

peak of 5 indan protons at 3.3 ppm

(c) Conversion to the corresponding acid Starting from:

--11 g (0.0306 mole) of ester obtained by (b) dissolved in 100 cc ethanol, and

--3.4 g (0.06 mole) potash dissolved in 100 cc water, the ester is converted to the acid under the conditions set forth in Example 8 (b).

After recrystallizing the product obtained in an acetic acid-water mixture, a solid melting at 157°-158° C. (capillary tube) is obtained.

Infrared Spectrum

-νNH: 3320 cm⁻¹

-νCO: 1720 cm⁻¹

-νCO: 1650 cm⁻¹

NMR Spectrum

clump of 7 aromatic protons at about 7.6 ppm

peak of 2 NH₂ protons at about 6.6 ppm

1 OH proton at about 10.5 ppm

5 indan protons at 3.4 ppm

Percent Analysis

    ______________________________________                                                    C%     H%       N%       S%                                         ______________________________________                                         Calculated   59.12    4.38     4.06   9.28                                     Experimental 59.38    4.14     4.09   9.24                                     ______________________________________                                    

EXAMPLE 13 5-(p-dimethylaminosulfonylbenzoyl)-indan-2-carboxylic acid ##STR24## (a) Methyl 5-(p-dimethylaminosulfonylbenzoyl)-indan-2-carboxylate

Empirical formula C₂₀ H₂₁ NO₅ S

This is prepared according to Example 12 (b) from:

28 g (0.074 mole) methyl 5-(p-chlorosulfonylbenzoyl)-indan-2-carboxylate in 90 cc chloroform, and

34 cc (0.148 mole) of a 40% dimethylamine solution in water.

(b) Conversion to the corresponding acid

The conversion is carried out according to Example 12 (c) from:

--21 g (0.0545 mole) of crude ester obtained in step (a) in 200 cc water, and

--6.15 g (0.11 mole) potash in 200 cc ethanol.

After recrystallization in an ethyl acetate-hexane mixture, a solid melting at 144°-145° C. (capillary tube) is obtained.

Infrared Spectrum

-νCO: 1700 cm⁻¹

-νCO: 1660 cm⁻¹

NMR Spectrum

peak of 4 aromatic protons at 7.97 ppm

clump of 3 aromatic protons at 7.53 ppm

peak of 5 indan protons at 3.3 ppm

peak of 6 CH₃ protons at 2.8 ppm

Percent Analysis

    ______________________________________                                                    C%     H%       N%       S%                                         ______________________________________                                         Calculated   61.11    5.13     3.75   8.57                                     Experimental 61.09    5.19     3.71   8.64                                     ______________________________________                                    

EXAMPLE 14 Ethyl 5-(4'-acetamido-3'-chlorobenzoyl)-indan-2-carboxylate ##STR25##

The following are introduced into a 250 cc reactor with a stirrer, cooler, dropping funnel and thermometer:

8.8 g (0.025 mole) of ethyl 5-(p-acetamidobenzoyl)-indan-2-carboxylate, and

30 cc acetic acid

40 cc acetic acid saturated with chlorine are added drop by drop at a temperature of about 10° C. The initial suspension disappears gradually. It is allowed to return to ambient temperature over one hour, then the acetic acid is concentrated in vacuo. An oil is obtained which, by recrystallization in an ethyl acetate-hexane mixture, gives a solid melting at 126°-127° C. (capillary tube).

Infrared Spectrum

-νNH: 3350 cm⁻¹

-νCO: 1740 cm⁻¹

-νCO: 1690 cm⁻¹

-νCO: 1650 cm⁻¹

NMR Spectrum

1 aromatic proton at about 8.6 ppm

clump of 6 aromatic protons centered at about 7.5 ppm

quadruplet of 2 CH₂ protons at about 4.2 ppm

5 indan protons at 3.33 ppm

peak of 3 CH₃ protons at 2.23 ppm

peak of 3 CH₃ protons at 1.3 ppm

Percent Analysis

    ______________________________________                                                   C %  H %        Cl %    N %                                          ______________________________________                                         Calculated  65.37  5.23       9.19  3.63                                       Experimental                                                                               65.50  5.22       9.15  3.63                                       ______________________________________                                    

EXAMPLE 15 5-(4',5'-dichloro-2'-thenoyl)-indan-2-carboxylic acid ##STR26##

The following are introduced into a 250 cc reactor equipped with a stirrer, a cooler, a dropping funnel, and a tube for bubbling gas into the reaction mixture:

5.2 g (0.017 mole) 5-(5'-chloro-2'-thenoyl)-indan-2-carboxylic acid.

27 cc acetic acid, saturated with chlorine, is added at about 15° C. The mixture is then heated in a water bath at about 75° C., bubbling chlorine through the reaction mixture. After cooling a solid is isolated by filtering with suction. The latter, recrystallized in ethyl acetate, has a melting point which stabilizes at 190°-192° C. (capillary tube).

Infrared Spectrum

-νCO: 1720 cm⁻¹

-νCO: 1650 cm⁻¹

NMR Spectrum

clump of 3 indan protons plus 1 thiophene proton centered at about 7.5 ppm

peak of 5 indan protons at 3.33 ppm

Percent Analysis

    ______________________________________                                                   C %  H %        Cl %    S %                                          ______________________________________                                         Calculated  52.80  2.95       20.78 9.40                                       Experimental                                                                               52.86  2.98       20.82 9.48                                       ______________________________________                                    

EXAMPLE 16 2'-(N,N-diethylaminoethyl) 5-(2'-thenoyl)-indan-2-carboxylate ##STR27##

(a) The following are introduced successively into a 500 cc reactor equipped with a stirrer, a cooler, and dropping funnel:

--27.1 g (0.1 mole) of 5-(2'-thenoyl)-indan-2-carboxylic acid,

--200 cc isopropanol,

--16.6 g (0.1 mole+20%) potassium carbonate,

--17.2 g (0.1 mole) chloroethyl diethylamine hydrochloride, and --150 cc isopropanol.

The mixture is refluxed for 15 hours. It is concentrated until dry, dissolved in water, and dilute hydrochloric acid, and washed in ether in an acid medium. The aqueous phase is passed in an alkaline medium and extracted with ether. It is dried on sodium sulfate and filtered, then the filtrate is concentrated.

The residue is distilled and an Eb₀.7-0.8 torr : 230°-240° C. fraction is recovered.

Infrared Spectrum

-νCO: 1740 cm⁻¹

-νCO: 1650 cm⁻¹

NMR Spectrum

clump of 6 aromatic protons at about 7.47 ppm

triplet of 2 CH₂ protons at about 4.2 ppm

peak of 5 indan protons at 3.33 ppm

clump of 6 CH₂ protons at about 2.7 ppm

triplet of 6 CH₃ protons at about 1.07 ppm

(b) Conversion to the hydrochloride: C₂₁ H₂₆ ClNO₃ S Mol. wt.=407.9

According to known techniques, a solid melting at 157°-158° C. (capillary tube) is obtained after recrystallization in ethanol.

Acidity Index

Experimental: 132

Calculated: 137

Infrared Spectrum

-νCO: 1745 cm⁻¹

-νCO: 1630 cm⁻¹

Percent Analysis (Hydrochloride)

    ______________________________________                                                  C %    H %    Cl %      N %  S %                                      ______________________________________                                         Calculated 61.83    6.43   8.69    3.43 7.86                                   Experimental                                                                              61.86    6.57   8.56    3.40 7.89                                   ______________________________________                                    

EXAMPLE 17 2'-(N,N-diethylaminoethyl) 5-(2'-furoyl)-indan-2-carboxylate ##STR28##

This compound is prepared according to Example 16 from:

21.4 g (0.0835 mole) 5-(2'-furoyl)-indan-2-carboxylic acid,

14.2 g (0.0835 mole+20%) potassium carbonate, and

14.4 g (0.0835 mole) chloroethyldiethylamine hydrochloride.

An Eb₀.5-0.4 torr : 200°-220° C. fraction is recovered by distillation.

Infrared Spectrum

-νCO: 1740 cm⁻¹

-νCO: 1650 cm⁻¹

NMR Spectrum

clump of 3 aromatic protons at about 7.83 ppm

clump of 2 aromatic protons at about 7.3 ppm

1 aromatic proton at about 6.53 ppm

clump of 2 CH₂ protons at about 4.1 ppm

peak of 5 indan protons at 3.33 ppm

clump of 6 CH₂ protons at about 2.7 ppm

clump of 6 CH₃ protons at about 1.07 ppm

Conversion to hydrochloride: C₂₁ H₂₆ ClNO₄

After recrystallization in an ethyl acetate-ethanol mixture, a solid melting at 165°-166.5° C. (capillary tube) is obtained.

Acidity Index

Calculated: 143

Experimental: 142

Percent Analysis (Hydrochloride)

    ______________________________________                                                   C %  H %        Cl %    N %                                          ______________________________________                                         Calculated  64.36  6.69       9.05  3.57                                       Experimental                                                                               64.44  6.49       8.98  3.53                                       ______________________________________                                    

EXAMPLE 18 N-[2'-(N',N'-diethylaminoethyl)] 5-benzoyl-indan-2-carboxamide ##STR29##

The following are introduced into a 250 cc reactor with a stirrer, a cooler, a dropping funnel, and a thermometer: -25.5 g (0.2 mole+10%) of 2-(N'N'-diethylamino)ethylamine, and -50 cc dioxane.

A solution of 30.2 g (0.1 mole) 5-benzoyl-indan-2-carboxylic acid chloride in 50 cc dioxane is added at a temperature between 10° and 20° C.

The mixture is allowed to return to ambient temperature, then stirred at this temperature for an hour. The dioxane is concentrated in vacuo, dissolved in ice water and extracted with ether in an alkaline medium. The ether extract is dried on sulfate, filtered, and the filtrate is concentrated. An oil is obtained on which an oxalate is made.

After recrystallization in an acetone-alcohol mixture, a melting point of 153°-154° C. (capillary tube) is obtained.

Acidity Index

Calculated: 246

Experimental: 226

Infrared Spectrum

-νCO: 1660 cm⁻¹

Percent Analysis (C₂₅ H₃₀ N₂ O₆)

    ______________________________________                                                   C %        H %    N %                                                ______________________________________                                         Calculated  66.07        6.65   6.17                                           Experimental                                                                               66.10        6.50   6.18                                           ______________________________________                                    

EXAMPLE 19 N-[2'-(N',N'-diethylaminoethyl)]5-(2'-thenoyl)-indan-2-carboxamide ##STR30##

This compound is prepared according to Example 18 from: -9.4 g (0.03 mole) 5-(2'-thenoyl)-indan-2-carboxylic acid chloride,

-7.7 g (0.066 mole) of 2-(N,N-diethylamino)ethylamine, and

-120 cc dioxane.

By passage with oxalate, one obtains, after recrystallization in acetone, a solid melting at 110°-112° C. (capillary tube).

Acidity Index

Calculated: 243

Experimental: 247

Infrared Spectrum

-νCO: 1630 cm⁻¹

NMR Spectrum

-clump of 6 aromatic protons at about 7.4 ppm

-clump of 5 indan +8 CH₂ protons at about 3.33 ppm

-triplet of 6 CH₃ protons at about 1.27 ppm

Percent Analysis

    ______________________________________                                                    C %  H %        N %    S %                                          ______________________________________                                         Calculated   59.98  6.13       6.09 6.96                                       Experimental 59.95  6.26       5.96 7.06                                       ______________________________________                                    

EXAMPLE 20 N-[2'-(N',N'-diethylaminoethyl)]5-(2',5'-dichlorobenzoyl)-indan-2-carboxamide ##STR31##

This compound is prepared according to Example 18 from:

-17.6 g (0.048 mole) 5-(2',5'-dichlorobenzoyl)-indan-2-carboxylic acid chloride.

-13.9 g (0.12 mole) 2-(N,N-diethylamino)ethylamine, and

-80 cc dioxane.

A solid melting at 103°-104° C. (capillary tube) is obtained by passage with oxalate and after recrystallization in acetone.

Acidity Index

Calculated: 216

Experimental: 206

Infrared Spectrum

-νCO: 1670 cm⁻¹

NMR Spectrum

-clump of 6 aromatic protons centered about 7.46 ppm

-clump of 5 indan +8 CH₂ protons at about 3.43 ppm

-triplet of 6 CH₃ protons at about 1.33 ppm

-1 NH proton at about 8.3 ppm

Percent Analysis (C₂₅ H₂₈ Cl₂ N₂ O₆)

    ______________________________________                                                   C %  H %        N %    Cl %                                          ______________________________________                                         Calculated  57.37  5.39       5.35 13.55                                       Experimental                                                                               57.38  5.48       5.39 13.56                                       ______________________________________                                    

The following clinical experimentation was carried out to clinically test various compounds in accordance with the present invention for their anti-inflammatory, analgesic and platelet aggregation or clumping inhibition activites.

Experiment A

The following case studies relate to the anti-inflammatory activity associated with the oral administration of 5-(5'-methyl-2'-thenoyl)-indan-2-carboxylic acid.

    ______________________________________                                         Case 1                                                                         ______________________________________                                         Name: MIRT . . . , C.                                                                             Age: 40  Sex: F                                             ______________________________________                                    

Diagonsis: Seropositive, classic, rheumatoid polyarthritis, radioclinical stage IV

Treatment: 600 mg/day for 3 weeks

Results:

Decrease in morning stiffness and peripheral pain.

Improved mobility.

Biologically: decrease in erythrocyte sedimentation rate (ESR).

Tolerance: Very good clinical and biological tolerance.

Conclusion: Good result.

    ______________________________________                                         Case 2                                                                         ______________________________________                                         Name: DUM . . . , M.                                                                              Age: 70  Sex: F                                             ______________________________________                                    

Diagnosis: Ankylosing spondylarthrittis with signs of peripheral joint inflammation

Treatment: 600 mg/day for 3 weeks

Results:

As effective as phenylbutazone.

Good mobility and decrease in articular perimeters.

Good analgesic effect.

Tolerance: Good clinical and biological tolerance.

Conclusion: Good result.

    ______________________________________                                         Case 3                                                                         ______________________________________                                         Name: PER . . . , P.                                                                             Age: 58  Sex: M                                              ______________________________________                                    

Diagnosis: Psoriatic peripheral rheumatism

Treatment: 600 mg/day for 15 days

Results:

Decrease in morning pain, decrease in articular perimeter, decrease in local heat.

Tolerance: Good clinical and biological tolerance.

Conclusion: Very good result.

Experiment B

The following case studies relate to the analgesic activity associated with the oral administration of methyl 5-(4'-dimethylaminobenzoyl)-indan-2-carboxylate.

    ______________________________________                                         Case 1                                                                         ______________________________________                                         Name: GAR . . . , J. P.                                                                           Age: 65  Sex: M                                             ______________________________________                                    

Diagnosis: Painful episode against a background of arthrosis of the cervical spine

Treatment: 600 mg/day for 3 weeks

Results:

Time taken to relieve pain: 30 minutes

Length of relief: 4 hours

Tolerance:

Clinical: NAD (Nothing Abnormal Discovered)

Biological: NAD

Conclusion: Good result

    ______________________________________                                         Case 2                                                                         ______________________________________                                         Name: BAR . . . , F.                                                                             Age: 50  Sex: F                                              ______________________________________                                    

Diagnosis: Pains in the right hip when pressure applied, secondary to aseptic osteonecrosis

Treatment: 600 mg/day for 15 days

Results:

Time to relieve pain: less than 15 minutes

Length of relief: 4 hours

Tolerance:

Clinical: NAD

Biological: NAD

Conclusion: Very good result

    ______________________________________                                         Case 3                                                                         ______________________________________                                         Name: GAS . . . , J. F.                                                                           Age: 55  Sex: M                                             ______________________________________                                    

Diagnosis: Arthrosis of the right hip resembling Paget's Disease

Treatment: 600 mg/day for 15 days

Results:

Time to relieve pain: 30 minutes

Length of relief: 2 hours

Tolerance:

Clinical: NAD

Biological: NAD

Conclusion: Good result

Experiment C

The following case studies relate to the platelet anti-aggregation activity associated with the oral administration of 2'-(N,N-diethylaminoethyl) 5-(2'-thenoyl)-indan-2-carboxylate.

    ______________________________________                                         Case 1                                                                         ______________________________________                                         Name: PUB . . . , F.                                                                             Age: 25  Sex: M                                              ______________________________________                                    

Aggregation with collagen before treatment: 100%

1 h after taking 200 mg: 0%

3 h after taking 200 mg: 0%

Inhibition of second phase of aggregation with ADP

Aggregation with collagen 24 hours after the last dose: 10%

    ______________________________________                                         Case 2                                                                         ______________________________________                                         Name: TH . . . , J. P.                                                                            Age: 24  Sex: M                                             ______________________________________                                    

Aggregation with collagen before treatment: 100%

1 h after taking 200 mg: 10%

3 h after taking 200 mg: 10%

Second phase of aggregation with ADP: 0%

Aggregation with collagen 24 hours after last dose: 15%

    ______________________________________                                         Case 3                                                                         ______________________________________                                         Name: BEL . . . , C.                                                                             Age: 25  Sex: M                                              ______________________________________                                    

Aggregation with collagen before treatment: 100%

1 h after taking 200 mg: 0%

3 h after taking 200 mg: 0%

Inhibition of second phase of aggregation with ADP

Aggregation with collagent 24 hours after last dose: 0%

It will be obvious to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is described in the specification. 

What is claimed is:
 1. A 5-substituted indan-2-carboxylic acid, or functional derivative thereof, having the formula: ##STR32## in which R is selected from the group consisting of furyl, alkylfurl, pyridyl, theinyl, and thienyl substituted by at least one of the substituents selected from the group consisting of halogen atoms and alkyl groups,in the free form or a therapeutically acceptable salt, ester or amide thereof.
 2. The compound of claim 1 wherein said therapeutically acceptable ester or amide is selected from the group consisting of the alkyl, dialkylaminoalkyl and cinnamoylamidoalkyl carboxylic acid esters and the dihydro, 2-hydroxyethyl and dialkylaminoalkyl carboxamides.
 3. The compound of claim 1 wherein R is furyl, alkylfuryl, thienyl or thienyl substituted by at least one of the substituents selected from the group consisting of halogen atoms and alkyl groups.
 4. The compound of claim 1 wherein R is furyl, furyl substituted by a methyl radical, thienyl or thienyl substituted by at least one substituent selected from the group consisting of chlorine and methyl.
 5. The compound of claim 1 in the form of a therapeutically acceptable ester wherein said ester comprises the dialkylaminoalkyl ester.
 6. The compound of claim 1 wherein R is a thienyl or substituted thienyl radical, in the form of a therapeutically acceptable amide, wherein sad amide comprises the dialkylaminoalkyl carboxamide.
 7. A therapeutic composition for combatting inflammation and pain comprising an anti-inflammatory or analgesic amount of a compound in accordance with claim 1 and a pharmaceutically acceptable excipient therefor.
 8. The composition in accordance with claim 7 in unit dosage form, each unit dose comprising from 50 to 500 mg of said compound. 